Metal-working machine.



J. C. FGTTER 65 J'. JOHNSTUN.

METAL WORKING MACHINE. APPLIUATION FILED MAR 1S. 1904.

Patented Sept. 10, 1912.

4 SHBETB--SHEET 1.

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J. O. POTTER 6: J. JOHNSTON.

METAL WORKING MACHINE. APPLICATION FIL'ED MAB.. 19. 1904.

Patented sept. 10,1912.

4 SHEETS-SHEET 2.

J. U. POTTER J. JGHNSTON. METAL WORKING MACHINE. APPLIOATION FILED MAR. 1s. 1904.

'15038,434, Patented sept. 1o, 1912 4 SHEETS-SHEET 3.

J. G. POTTER & J. JOHNSTON. METAL WORKING MACHINE.

APPLmATIQN FILED 1211111.19. 1904. 434@ P'GIlGd SGpJ. 10, 1912.

4 sums-SHEET 4.

woentow fio strnrns Arnnr JAMES CHARLES EOTTER AND JOHN JOHNSTON, 0F PAWTUCKET, RHODE ISLANH, ASSIGNORS TG POTTER AND JOHNSTON MACHINE CQIVIPANY, OIF PAWTUGKET, RHDE ISLAND, .A CORPORATION 0F RHODE llSluzilhTllll METAL-WORKING MACHINE.

Specification oi' Letters Patent.

intenten sept. io, isis.

Application filed March 19, 1904i. Serial Ito. 3.99,@8.

To all whom it may concern Be it known that We, JAMES C. Po'r'rnn and Jenn tlonini'rcm, oit Pawtucket, in the county ot Providence, and in the State of .Rhode lslond, have invented a certain new end nseinl improvement in MetaLWorkingj ,ltziachines, end do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the acconinonying drawings, in which ilignre l. is s longitudinal section of a machine embodying our invention; Fig. 2 is e view of rear elevation oit n portion of the machine; Fig. 3 is a section on the line 3-3 oit Fig'. l.; fl is a detail view in section of' the diilerential gear; and Fig. 5 is :i detail 'View oit the speed-changing Wheel.

The object of our invention is to improve the construction of machines for turning or performing other operations on metal so as to increase the eliiciency of such machines, and by nnproving;r their accuracy in the peritormance ont the operations, and to these ends our invention consists in the machine having' the 'features of' construction snlostinrtialli7 as hereafter specified and claimed.

The machine selected for illustration in which we have embodied our invention isen automatic turret lathe, but it is to be understood that We do' not limit ourselves to a turret lathe, nor to an automatic machine in respect to those features of ein invention that are applicable to machines other than those oil this description. ln said machine, the spindle A having a. clinch' B, Whose con struction need not be described, is mounted hearings on the head stock C rising 'from a bese or freine D. As the gearing for driving the spindle forms no part of this invention, itivillnot be described in detail, its particular construction. and operation beingl fully illnstratcd and described in Potter d: Johnston'A Machine Companys Patent No. TSLQO, dated .lune 7, 1904, on an applicw tion lled May 8, 1902, which embodied the anibjectl matter of the present application, and contained claims which under the requirements of the Patent Oliice were not permissible in said application tiled May 8,

1902, and therefore the present application has heen filed. A; general. description. of the spindle driving mechanism herein is how ever desirable, it comprising tivo gears vl0 of diilerent diameter, with which mesh pinions ll also ot diierent diameter each driven by a cone pulley on a shaft 13 mounted oi. the heed of stoclrvso that by clutching om` gear or the other to the spindle the letter may be revolved at dierent speeds in the seme direction to suit the speed requirements ot different kinds ol' work. The clutch may be shifted either automatically or by hand to canse the spindle to run. at the required different speeds for the performance voi Work.

For reciprocating the turret or tool slide E a drum Fon the shaft G'is used, having on itsv periphery earn plates f that engage a roller on a bar El, mounted Ato slide in guides on the frame d, and having on its diaper side rock teeth that mesh with a pinion 'Jl on a shaft mounted on the turret block and meshing With a rack on the under side of the turret slide. The arrangement of the com plates is a familiar one and need not, theretore, be described. For revolving the drum, there is ettoched to it on one side a spur gear J' with which meshes a pinion K on one end of a shaft L on Whose other end is a gear Wheel M. Meshingwith said Wheel is a pinion N, on the same shaft With a gear O in mesh With a pinion P 'fast to n. hollow sleeve or shaft g loose on the shaft G, and 'driven by a diligerential gear hereinafter described. The advantage of driving the cam drum F, as above described, over the prac tice which has heretofore prevailed of 'driving the drum from the shaft, is that the drum is revolved easily and smoothly, without objectionable strains on the parts that are apt to damage them and canse such twisting of the drum as to derange the proper relative position of the com plates and the roller on theslidesaetueting device, and produce inaccurate movements of the slide. Our gearing tor driving the drum,

4being composed of simple spur gears, is not subject to wear to an, extent as to impair the accuracy of the mechanism or he otherf differentialI Gear. l

of the branches of the yoke, and preferably wise objectionable.. rlhe drum F is keyed to .the shaft G and, therefore, the latter is given its motion from the drum.

As is usual, provision is made for moving` the tool-carrying slide at different speeds,

a differential gear, as is common, being em'- ployed for this purpose. Forshifting the clutch and pawl of the differential gear automatically, a shaft Q, is journaled 1n bearings in the frame D, on'one end of which is a star wheel R situated to have its teeth engaged by. ins or studs S. attached to a wheel T on t e shaft G. Eachpin or studj moves the Wheel and its shaft through the: distance of one tooth. A friction device,A

such as a iber washer, is applied to the star wheel to prevent its goingbeyond the *pointv at which a pin leaves it. On the other end of the shaft Q. there are several inclined or cam surfaces q adapted lto coact with simi* lar surfaces at one end of a sliding yoke U:

mounted on an extension of the shaft'Q. The cam faces on the shaft Q, engaging those on the yoke will, by the rotation of lthe shaft, slide the yoke in one direction.

in a hardened plate attached thereto, is a notch u with two inclined sides adapted to act on the end of a radial arm z on a rock shaft Z journaled in bearings in the 'frame D to which is attached the pawl Ar of the differential gear. The yoke, it will be ob* served, operates both the clutch and the pawl of the differential gear. When the yoke is moved in either direction a sufficient distance, one or the 'other' inclinesfwill engage the arm, and the shaft Z being thereby rocked, the pawl of the differential gear will be disengaged from its ratchet.

To enable the yoke to be moved by hand so that the change of speed of the tool'slide can be made at will, a lever B attached to a rock shaft C engages a pin or stud u on the yoke and is adapted to be operated by a hand lever D on the rock shaft. In view ofthe fact that the yoke may be held by the hand lever with its cam surfaces engaging those of the shaft Q and the starwheel R'be engaged by the pins or studs S, the shaft Q is movable longitudinally, so that it may 'revolve under these circumstances, and breakage of the parts is prevented. For returning the shaft to its normal position, from which it may be moved by the action of the cam surfaces on each other, 'a coiled spring yE is provided.

Ounmechanism for automatically operating the. yoke is simple, and Works very easily and smoothly. The clutch sleeve Y of; the di'erential gea-r has connected to itl 4at diametrically opposite points two bolts y that pass each through a hole in a cone pulley F so that they may engage clutchteeth on the side of the gear wheel of the differential gear, which is fixed` or keyed to the sleeve g. When the cone pulley and the xed gear ofthe differential gear are clutched together, the sleeve g carrying' the pinion P is directlyl driven from the cone pulley, while when vsaid pulley and gear are unclutched, said sleeve and pinion are driven .through the sun and planet gearing.

As in the case of the machine of Patent No. 761,905, issued June 7, 1904, the turret slide moving drum .is geared vto the spindle A.vvhich has on it a cone pulley F2 which is connected'by a belt with the cone pulley F of the cam drum revolving mechanism,

so that power to rotate the cam drum`l to actuate the turret slide is taken from the work spindle By gearing the turret slide moving means and the work spindle together, it will be seen that the relation of spindle speed and tool-feeding speed is maintained at a constant or vfixed ratio, s0 that any liability to improper relation of speed of rotation of work and feed of ltool is avoided, which is not the case where the cam druml and the spindle are not geared together.

The cam plates on the drum F which move the tool-slide to the work have such length as to move the slide through the greatestI extent of travel it is desired it shall have'. For adjusting the parts so that the tool-slide will move at the fast speed until the tool engages the work, when the length of travel of the slide during the "operation of the tool on the work is less than the entire length of travel of the slide, the .slidebperatng roll is moved to the point on the cam where the slower 1working feed isto begin, and then one of the pins of studs S on the speed-changing wheel T drum F being revolved to carry the slideoperating roller to the end of the cameplate,-

the next following pin or stud S on the speed-changing wheel T is secured in a position on the wheel to engage a tooth of the star-Wheel to aetuate the latter to eect a attendee gfiiaiige of the ditterential gear from the,

slow to the 'East speed.

Although our machine is so constructed that the changes of speed oi' revolution of the spindleand sgi/eed ot the tool-sliclo are eli? ted antmnatically, yet the revolution oi the spindie and the movements of the tooi--siide ai eoi'ati'ollzizble at the will ot' the operator. l ence, if by' the action of the atie mechanism the spindlebe revolv- Y 1 the .si/eed, yet it it be desired to run it is truiy chociied-tiiis can'be accomplished by operating the hand lever l, and it it be desired to stop the revoiution ci' the spindle such can be ldone by operating the said levers .l and S to nnolutoh the gear Wheels l0 troni the spindle. By means oi' the hand lever D the volte V which actuates the pawl and clutch the differential gear, may he nioved to a position to disengage both the clutch and the pawl, thus stopping the revo lotion ot the drum l?, and consequently the V movement of the tool-slide.

lt may be moved to a position to engage the ipaivl and ratchet ot the differential gear, but not the riutch, so to run the drinn F at a sneed to cause the slow travel of the tool-slide, and it may he moved to a position to disengage .said patri and ratchet and to'engage the oliitch oi" the differential gear, and thereby canse the tool-sli de to lmore at ay high speed,

ln working on some objects, such, for eX- ample, as pulley, which requires facing of both ends oit its huh, rechuoling is necessary for facing the end of the hob Within the chuck, To avboid the necessity for re-chncliini', and automatically to face the end of the hub within the chuck, We provide our machine with a baci; facing" attachment. This comprises a longitudinally .movable rod Gr passing through the spindle A that carries on its front end the facing tool H which, by the movement of the rod at the proper time, is brought to, and removed 1oin,iposition tor Work. The operation oi the back facing tool is preferably so timed that said too] Wilt do its Work While similar Work is being' dono on the outer end of the hub, as thus any tendency oim the back facing ltool to push the work ontI of the chuck will be opposed. For moving' the rod. G longitudinally, any desired inechanisnimay be employed, such for example, as that shown, which comprises a lever if pivoted to a bracket on the head stock and [connected at one end by links 2l" to the rod, and at the other end by the link li" to one end o1 a lever L pivoted to a bracket M on the frame D, and having on its other end a roller that is alternately engaged by Cain platos n on a drinn fllf on the shaft ti.;

lt is to be understood that though', in this the Faster speed-#tor example,` when it is desired to' see whether the Work.v

speciiication, ,We have described, with ticularity, details ont construction, and though in the embodiment oit our invention shownl and described We prefer tl e, detaile of eonstri'iction, We' navet-theta' do, not iimit ourselves to any special consti-notion or organization v oit the members o1? the machine.

I-iaving thas described our inveiition, iiliiai We claim is y Y l. The combination of. a worlt spindle, ditl'erent of gears for driving' it di. ferent ivoiirpeitori1iing speeds in the same direction, automatic means to change the gear connection with the spindle, a. tool slide movable at diii'erent speeds at ditm ferent times and in the same direction for the performance oit Work, and While the spindle is revolving in the same' direction, means for moving said slide, and gearing between the slide lmoving means and the Work spindle that preserves the ratio oi Working spindie speed and Working` .i'eedoii tool.

2. The combination Witlithe Work dle and the tool slide, oi" a driving member., a gear connection from said driving member to said Work spindle, including; a plurality of trains ot gears, said trains,A respectively, driving the spindle at different Working speeds, automatically operated clutch ineciianism for said trains oi gears, and means for gearing the spindle and the tool slide to ,gether that preserves the ratio of Working;

spindle speed and Working feed of tool'.4

3. The combination with the Work spindle and the tool slide, of a driving shaft, gearing between saidl shaft and the Work spindie to drive the same at dilerent- Working speeds, comprising a pair of gears of dii'- erent'diarneter on the shaft, and a pair of gears on the spindle of ditierent diameters respectively meshing with those on the drive shaft, a clutch for controlling the gear conneotion between the drive shaftand the spindle, means automatically operating the clutch, and means for gearing the spindle and the tool slide together that preserves the ratio of Working spindle speed and worlring feed of tooi.

fl. rlthe combination with the Work spin die, rotatable at different Working speeds, and the turret slide, ot' a driving member, a connection from said driving member to said Work spindle, a driving connection Jfrom the spindle to said turret slide that preserves the ratio of Working spindle speed and working feed of tool, and auto matie speed,` changmgi,r means located'in adhv l Vance of said driving connection.

5. The combination of a Work holdingmeans and a driving shaftoperatively connected therewith, dilierent sets ot gears for driving said shaft in the saine difectlon for ienent Work performing speeds of the Work holding means, automatio'means no change the gear connections with said shaft, e, tool slide movable at derent speeds and in the saine direction for the peroi'mance of Work and While the Work holding means is revolving in the same direction, means 'for moving said slide, and gearing between the sie moving means and said shaft that pret i noem-ee 

